1 // class template regex -*- C++ -*- 2 3 // Copyright (C) 2010-2019 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** 26 * @file bits/regex_compiler.h 27 * This is an internal header file, included by other library headers. 28 * Do not attempt to use it directly. @headername{regex} 29 */ 30 31 namespace std _GLIBCXX_VISIBILITY(default) 32 { 33 _GLIBCXX_BEGIN_NAMESPACE_VERSION 34 _GLIBCXX_BEGIN_NAMESPACE_CXX11 35 36 template<typename> 37 class regex_traits; 38 39 _GLIBCXX_END_NAMESPACE_CXX11 40 41 namespace __detail 42 { 43 /** 44 * @addtogroup regex-detail 45 * @{ 46 */ 47 48 template<typename, bool, bool> 49 struct _BracketMatcher; 50 51 /** 52 * @brief Builds an NFA from an input iterator range. 53 * 54 * The %_TraitsT type should fulfill requirements [28.3]. 55 */ 56 template<typename _TraitsT> 57 class _Compiler 58 { 59 public: 60 typedef typename _TraitsT::char_type _CharT; 61 typedef const _CharT* _IterT; 62 typedef _NFA<_TraitsT> _RegexT; 63 typedef regex_constants::syntax_option_type _FlagT; 64 65 _Compiler(_IterT __b, _IterT __e, 66 const typename _TraitsT::locale_type& __traits, _FlagT __flags); 67 68 shared_ptr<const _RegexT> 69 _M_get_nfa() 70 { return std::move(_M_nfa); } 71 72 private: 73 typedef _Scanner<_CharT> _ScannerT; 74 typedef typename _TraitsT::string_type _StringT; 75 typedef typename _ScannerT::_TokenT _TokenT; 76 typedef _StateSeq<_TraitsT> _StateSeqT; 77 typedef std::stack<_StateSeqT> _StackT; 78 typedef std::ctype<_CharT> _CtypeT; 79 80 // accepts a specific token or returns false. 81 bool 82 _M_match_token(_TokenT __token); 83 84 void 85 _M_disjunction(); 86 87 void 88 _M_alternative(); 89 90 bool 91 _M_term(); 92 93 bool 94 _M_assertion(); 95 96 bool 97 _M_quantifier(); 98 99 bool 100 _M_atom(); 101 102 bool 103 _M_bracket_expression(); 104 105 template<bool __icase, bool __collate> 106 void 107 _M_insert_any_matcher_ecma(); 108 109 template<bool __icase, bool __collate> 110 void 111 _M_insert_any_matcher_posix(); 112 113 template<bool __icase, bool __collate> 114 void 115 _M_insert_char_matcher(); 116 117 template<bool __icase, bool __collate> 118 void 119 _M_insert_character_class_matcher(); 120 121 template<bool __icase, bool __collate> 122 void 123 _M_insert_bracket_matcher(bool __neg); 124 125 // Returns true if successfully matched one term and should continue. 126 // Returns false if the compiler should move on. 127 template<bool __icase, bool __collate> 128 bool 129 _M_expression_term(pair<bool, _CharT>& __last_char, 130 _BracketMatcher<_TraitsT, __icase, __collate>& 131 __matcher); 132 133 int 134 _M_cur_int_value(int __radix); 135 136 bool 137 _M_try_char(); 138 139 _StateSeqT 140 _M_pop() 141 { 142 auto ret = _M_stack.top(); 143 _M_stack.pop(); 144 return ret; 145 } 146 147 _FlagT _M_flags; 148 _ScannerT _M_scanner; 149 shared_ptr<_RegexT> _M_nfa; 150 _StringT _M_value; 151 _StackT _M_stack; 152 const _TraitsT& _M_traits; 153 const _CtypeT& _M_ctype; 154 }; 155 156 template<typename _Tp> 157 struct __is_contiguous_iter : is_pointer<_Tp>::type { }; 158 159 template<typename _Tp, typename _Cont> 160 struct 161 __is_contiguous_iter<__gnu_cxx::__normal_iterator<_Tp*, _Cont>> 162 : true_type { }; 163 164 template<typename _Iter, typename _TraitsT> 165 using __enable_if_contiguous_iter 166 = __enable_if_t< __is_contiguous_iter<_Iter>::value, 167 std::shared_ptr<const _NFA<_TraitsT>> >; 168 169 template<typename _Iter, typename _TraitsT> 170 using __disable_if_contiguous_iter 171 = __enable_if_t< !__is_contiguous_iter<_Iter>::value, 172 std::shared_ptr<const _NFA<_TraitsT>> >; 173 174 template<typename _TraitsT, typename _FwdIter> 175 inline __enable_if_contiguous_iter<_FwdIter, _TraitsT> 176 __compile_nfa(_FwdIter __first, _FwdIter __last, 177 const typename _TraitsT::locale_type& __loc, 178 regex_constants::syntax_option_type __flags) 179 { 180 size_t __len = __last - __first; 181 const auto* __cfirst = __len ? std::__addressof(*__first) : nullptr; 182 using _Cmplr = _Compiler<_TraitsT>; 183 return _Cmplr(__cfirst, __cfirst + __len, __loc, __flags)._M_get_nfa(); 184 } 185 186 template<typename _TraitsT, typename _FwdIter> 187 inline __disable_if_contiguous_iter<_FwdIter, _TraitsT> 188 __compile_nfa(_FwdIter __first, _FwdIter __last, 189 const typename _TraitsT::locale_type& __loc, 190 regex_constants::syntax_option_type __flags) 191 { 192 const basic_string<typename _TraitsT::char_type> __str(__first, __last); 193 return __compile_nfa<_TraitsT>(__str.data(), __str.data() + __str.size(), 194 __loc, __flags); 195 } 196 197 // [28.13.14] 198 template<typename _TraitsT, bool __icase, bool __collate> 199 class _RegexTranslatorBase 200 { 201 public: 202 typedef typename _TraitsT::char_type _CharT; 203 typedef typename _TraitsT::string_type _StringT; 204 typedef _StringT _StrTransT; 205 206 explicit 207 _RegexTranslatorBase(const _TraitsT& __traits) 208 : _M_traits(__traits) 209 { } 210 211 _CharT 212 _M_translate(_CharT __ch) const 213 { 214 if (__icase) 215 return _M_traits.translate_nocase(__ch); 216 else if (__collate) 217 return _M_traits.translate(__ch); 218 else 219 return __ch; 220 } 221 222 _StrTransT 223 _M_transform(_CharT __ch) const 224 { 225 _StrTransT __str(1, __ch); 226 return _M_traits.transform(__str.begin(), __str.end()); 227 } 228 229 // See LWG 523. It's not efficiently implementable when _TraitsT is not 230 // std::regex_traits<>, and __collate is true. See specializations for 231 // implementations of other cases. 232 bool 233 _M_match_range(const _StrTransT& __first, const _StrTransT& __last, 234 const _StrTransT& __s) const 235 { return __first <= __s && __s <= __last; } 236 237 protected: 238 bool _M_in_range_icase(_CharT __first, _CharT __last, _CharT __ch) const 239 { 240 typedef std::ctype<_CharT> __ctype_type; 241 const auto& __fctyp = use_facet<__ctype_type>(this->_M_traits.getloc()); 242 auto __lower = __fctyp.tolower(__ch); 243 auto __upper = __fctyp.toupper(__ch); 244 return (__first <= __lower && __lower <= __last) 245 || (__first <= __upper && __upper <= __last); 246 } 247 248 const _TraitsT& _M_traits; 249 }; 250 251 template<typename _TraitsT, bool __icase, bool __collate> 252 class _RegexTranslator 253 : public _RegexTranslatorBase<_TraitsT, __icase, __collate> 254 { 255 public: 256 typedef _RegexTranslatorBase<_TraitsT, __icase, __collate> _Base; 257 using _Base::_Base; 258 }; 259 260 template<typename _TraitsT, bool __icase> 261 class _RegexTranslator<_TraitsT, __icase, false> 262 : public _RegexTranslatorBase<_TraitsT, __icase, false> 263 { 264 public: 265 typedef _RegexTranslatorBase<_TraitsT, __icase, false> _Base; 266 typedef typename _Base::_CharT _CharT; 267 typedef _CharT _StrTransT; 268 269 using _Base::_Base; 270 271 _StrTransT 272 _M_transform(_CharT __ch) const 273 { return __ch; } 274 275 bool 276 _M_match_range(_CharT __first, _CharT __last, _CharT __ch) const 277 { 278 if (!__icase) 279 return __first <= __ch && __ch <= __last; 280 return this->_M_in_range_icase(__first, __last, __ch); 281 } 282 }; 283 284 template<typename _CharType> 285 class _RegexTranslator<std::regex_traits<_CharType>, true, true> 286 : public _RegexTranslatorBase<std::regex_traits<_CharType>, true, true> 287 { 288 public: 289 typedef _RegexTranslatorBase<std::regex_traits<_CharType>, true, true> 290 _Base; 291 typedef typename _Base::_CharT _CharT; 292 typedef typename _Base::_StrTransT _StrTransT; 293 294 using _Base::_Base; 295 296 bool 297 _M_match_range(const _StrTransT& __first, const _StrTransT& __last, 298 const _StrTransT& __str) const 299 { 300 __glibcxx_assert(__first.size() == 1); 301 __glibcxx_assert(__last.size() == 1); 302 __glibcxx_assert(__str.size() == 1); 303 return this->_M_in_range_icase(__first[0], __last[0], __str[0]); 304 } 305 }; 306 307 template<typename _TraitsT> 308 class _RegexTranslator<_TraitsT, false, false> 309 { 310 public: 311 typedef typename _TraitsT::char_type _CharT; 312 typedef _CharT _StrTransT; 313 314 explicit 315 _RegexTranslator(const _TraitsT&) 316 { } 317 318 _CharT 319 _M_translate(_CharT __ch) const 320 { return __ch; } 321 322 _StrTransT 323 _M_transform(_CharT __ch) const 324 { return __ch; } 325 326 bool 327 _M_match_range(_CharT __first, _CharT __last, _CharT __ch) const 328 { return __first <= __ch && __ch <= __last; } 329 }; 330 331 template<typename _TraitsT, bool __is_ecma, bool __icase, bool __collate> 332 struct _AnyMatcher; 333 334 template<typename _TraitsT, bool __icase, bool __collate> 335 struct _AnyMatcher<_TraitsT, false, __icase, __collate> 336 { 337 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 338 typedef typename _TransT::_CharT _CharT; 339 340 explicit 341 _AnyMatcher(const _TraitsT& __traits) 342 : _M_translator(__traits) 343 { } 344 345 bool 346 operator()(_CharT __ch) const 347 { 348 static auto __nul = _M_translator._M_translate('\0'); 349 return _M_translator._M_translate(__ch) != __nul; 350 } 351 352 _TransT _M_translator; 353 }; 354 355 template<typename _TraitsT, bool __icase, bool __collate> 356 struct _AnyMatcher<_TraitsT, true, __icase, __collate> 357 { 358 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 359 typedef typename _TransT::_CharT _CharT; 360 361 explicit 362 _AnyMatcher(const _TraitsT& __traits) 363 : _M_translator(__traits) 364 { } 365 366 bool 367 operator()(_CharT __ch) const 368 { return _M_apply(__ch, typename is_same<_CharT, char>::type()); } 369 370 bool 371 _M_apply(_CharT __ch, true_type) const 372 { 373 auto __c = _M_translator._M_translate(__ch); 374 auto __n = _M_translator._M_translate('\n'); 375 auto __r = _M_translator._M_translate('\r'); 376 return __c != __n && __c != __r; 377 } 378 379 bool 380 _M_apply(_CharT __ch, false_type) const 381 { 382 auto __c = _M_translator._M_translate(__ch); 383 auto __n = _M_translator._M_translate('\n'); 384 auto __r = _M_translator._M_translate('\r'); 385 auto __u2028 = _M_translator._M_translate(u'\u2028'); 386 auto __u2029 = _M_translator._M_translate(u'\u2029'); 387 return __c != __n && __c != __r && __c != __u2028 && __c != __u2029; 388 } 389 390 _TransT _M_translator; 391 }; 392 393 template<typename _TraitsT, bool __icase, bool __collate> 394 struct _CharMatcher 395 { 396 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 397 typedef typename _TransT::_CharT _CharT; 398 399 _CharMatcher(_CharT __ch, const _TraitsT& __traits) 400 : _M_translator(__traits), _M_ch(_M_translator._M_translate(__ch)) 401 { } 402 403 bool 404 operator()(_CharT __ch) const 405 { return _M_ch == _M_translator._M_translate(__ch); } 406 407 _TransT _M_translator; 408 _CharT _M_ch; 409 }; 410 411 /// Matches a character range (bracket expression) 412 template<typename _TraitsT, bool __icase, bool __collate> 413 struct _BracketMatcher 414 { 415 public: 416 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 417 typedef typename _TransT::_CharT _CharT; 418 typedef typename _TransT::_StrTransT _StrTransT; 419 typedef typename _TraitsT::string_type _StringT; 420 typedef typename _TraitsT::char_class_type _CharClassT; 421 422 public: 423 _BracketMatcher(bool __is_non_matching, 424 const _TraitsT& __traits) 425 : _M_class_set(0), _M_translator(__traits), _M_traits(__traits), 426 _M_is_non_matching(__is_non_matching) 427 { } 428 429 bool 430 operator()(_CharT __ch) const 431 { 432 _GLIBCXX_DEBUG_ASSERT(_M_is_ready); 433 return _M_apply(__ch, _UseCache()); 434 } 435 436 void 437 _M_add_char(_CharT __c) 438 { 439 _M_char_set.push_back(_M_translator._M_translate(__c)); 440 _GLIBCXX_DEBUG_ONLY(_M_is_ready = false); 441 } 442 443 _StringT 444 _M_add_collate_element(const _StringT& __s) 445 { 446 auto __st = _M_traits.lookup_collatename(__s.data(), 447 __s.data() + __s.size()); 448 if (__st.empty()) 449 __throw_regex_error(regex_constants::error_collate, 450 "Invalid collate element."); 451 _M_char_set.push_back(_M_translator._M_translate(__st[0])); 452 _GLIBCXX_DEBUG_ONLY(_M_is_ready = false); 453 return __st; 454 } 455 456 void 457 _M_add_equivalence_class(const _StringT& __s) 458 { 459 auto __st = _M_traits.lookup_collatename(__s.data(), 460 __s.data() + __s.size()); 461 if (__st.empty()) 462 __throw_regex_error(regex_constants::error_collate, 463 "Invalid equivalence class."); 464 __st = _M_traits.transform_primary(__st.data(), 465 __st.data() + __st.size()); 466 _M_equiv_set.push_back(__st); 467 _GLIBCXX_DEBUG_ONLY(_M_is_ready = false); 468 } 469 470 // __neg should be true for \D, \S and \W only. 471 void 472 _M_add_character_class(const _StringT& __s, bool __neg) 473 { 474 auto __mask = _M_traits.lookup_classname(__s.data(), 475 __s.data() + __s.size(), 476 __icase); 477 if (__mask == 0) 478 __throw_regex_error(regex_constants::error_collate, 479 "Invalid character class."); 480 if (!__neg) 481 _M_class_set |= __mask; 482 else 483 _M_neg_class_set.push_back(__mask); 484 _GLIBCXX_DEBUG_ONLY(_M_is_ready = false); 485 } 486 487 void 488 _M_make_range(_CharT __l, _CharT __r) 489 { 490 if (__l > __r) 491 __throw_regex_error(regex_constants::error_range, 492 "Invalid range in bracket expression."); 493 _M_range_set.push_back(make_pair(_M_translator._M_transform(__l), 494 _M_translator._M_transform(__r))); 495 _GLIBCXX_DEBUG_ONLY(_M_is_ready = false); 496 } 497 498 void 499 _M_ready() 500 { 501 std::sort(_M_char_set.begin(), _M_char_set.end()); 502 auto __end = std::unique(_M_char_set.begin(), _M_char_set.end()); 503 _M_char_set.erase(__end, _M_char_set.end()); 504 _M_make_cache(_UseCache()); 505 _GLIBCXX_DEBUG_ONLY(_M_is_ready = true); 506 } 507 508 private: 509 // Currently we only use the cache for char 510 typedef typename std::is_same<_CharT, char>::type _UseCache; 511 512 static constexpr size_t 513 _S_cache_size = 514 1ul << (sizeof(_CharT) * __CHAR_BIT__ * int(_UseCache::value)); 515 516 struct _Dummy { }; 517 typedef typename std::conditional<_UseCache::value, 518 std::bitset<_S_cache_size>, 519 _Dummy>::type _CacheT; 520 typedef typename std::make_unsigned<_CharT>::type _UnsignedCharT; 521 522 bool 523 _M_apply(_CharT __ch, false_type) const; 524 525 bool 526 _M_apply(_CharT __ch, true_type) const 527 { return _M_cache[static_cast<_UnsignedCharT>(__ch)]; } 528 529 void 530 _M_make_cache(true_type) 531 { 532 for (unsigned __i = 0; __i < _M_cache.size(); __i++) 533 _M_cache[__i] = _M_apply(static_cast<_CharT>(__i), false_type()); 534 } 535 536 void 537 _M_make_cache(false_type) 538 { } 539 540 private: 541 std::vector<_CharT> _M_char_set; 542 std::vector<_StringT> _M_equiv_set; 543 std::vector<pair<_StrTransT, _StrTransT>> _M_range_set; 544 std::vector<_CharClassT> _M_neg_class_set; 545 _CharClassT _M_class_set; 546 _TransT _M_translator; 547 const _TraitsT& _M_traits; 548 bool _M_is_non_matching; 549 _CacheT _M_cache; 550 #ifdef _GLIBCXX_DEBUG 551 bool _M_is_ready = false; 552 #endif 553 }; 554 555 //@} regex-detail 556 } // namespace __detail 557 _GLIBCXX_END_NAMESPACE_VERSION 558 } // namespace std 559 560 #include <bits/regex_compiler.tcc> 561